Analysis
- max time kernel
143s - max time network
156s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
15/04/2024, 17:40
General
- Target Client-built.exe
- Size 3.1MB
- Sample240415-v8797acc37
- SHA256 fb940da7e625a7e7b7d4e913f9e7acd83ba52103be0a7b98623000a48d41168e
Malware Config
Extracted
-
quasar
-
1.4.1
-
offf
-
91.22.255.243:4782
-
d3eb5eb7-abe6-4e1e-8467-07667e6bb118
-
encryption_key
9954AE41F5CEAC39C977EBA3EE22C2C9481A45CC
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Windows Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1408 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:81⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Client.exe
memory/2896-9-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp
memory/2896-10-0x000000001B500000-0x000000001B510000-memory.dmp
memory/2896-11-0x000000001C0A0000-0x000000001C0F0000-memory.dmp
memory/2896-12-0x000000001C1B0000-0x000000001C262000-memory.dmp
memory/2896-13-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp
memory/2896-14-0x000000001B500000-0x000000001B510000-memory.dmp
memory/3248-0-0x0000000000070000-0x0000000000394000-memory.dmp
memory/3248-1-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp
memory/3248-2-0x0000000002570000-0x0000000002580000-memory.dmp
memory/3248-8-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp